During air cooling of oranges, grapefruit, andtangelos, the heat transfer coefficient for combined convection,radiation, and evaporation for air velocities of0.11 < V < 0.33 m/s is determined experimentally and isexpressed as h = 5.05 kair Re1/3/D, where the diameter Dis the characteristic length. Oranges are cooled by refrigeratedair at 5°C and 1 atm at a velocity of 0.3 m/s. Determine(a) the initial rate of heat transfer from a 7-cm-diameterorange initially at 15°C with a thermal conductivity of0.50 W/m·K, (b) the value of the initial temperature gradientinside the orange at the surface, and (c) the value of theNusselt number.
During air cooling of oranges, grapefruit, andtangelos, the heat transfer coefficient for combined convection,radiation, and evaporation for air velocities of0.11 < V < 0.33 m/s is determined experimentally and isexpressed as h = 5.05 kair Re1/3/D, where the diameter Dis the characteristic length. Oranges are cooled by refrigeratedair at 5°C and 1 atm at a velocity of 0.3 m/s. Determine(a) the initial rate of heat transfer from a 7-cm-diameterorange initially at 15°C with a thermal conductivity of0.50 W/m·K, (b) the value of the initial temperature gradientinside the orange at the surface, and (c) the value of theNusselt number.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
During air cooling of oranges, grapefruit, and
tangelos, the heat transfer coefficient for combined convection,
radiation, and evaporation for air velocities of
0.11 < V < 0.33 m/s is determined experimentally and is
expressed as h = 5.05 kair Re1/3/D, where the diameter D
is the characteristic length. Oranges are cooled by refrigerated
air at 5°C and 1 atm at a velocity of 0.3 m/s. Determine
(a) the initial rate of heat transfer from a 7-cm-diameter
orange initially at 15°C with a thermal conductivity of
0.50 W/m·K, (b) the value of the initial temperature gradient
inside the orange at the surface, and (c) the value of the
Nusselt number.
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